linux-kernel - Re: [patch 2/2] Documentation/process: Add tip tree handbook

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Message-ID: <20181108223329.GA19357@kroah.com>
Date:   Thu, 8 Nov 2018 14:33:29 -0800
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "Theodore Y. Ts'o" <tytso@....edu>,
        Dan Williams <dan.j.williams@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        X86 ML <x86@...nel.org>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        John Stultz <john.stultz@...aro.org>, acme@...hat.com,
        frederic@...nel.org, Jonathan Corbet <corbet@....net>,
        Andy Lutomirski <luto@...nel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Will Deacon <will.deacon@....com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [patch 2/2] Documentation/process: Add tip tree handbook

On Thu, Nov 08, 2018 at 05:19:47PM -0500, Theodore Y. Ts'o wrote:
> On Thu, Nov 08, 2018 at 01:04:49PM -0800, Greg KH wrote:
> > > (Also note that even with fast SSD's and/or everything in page cache,
> > > runnning "tag --contains <COMMITID>" will take a good 3-4 seconds, and
> > > if the git packs are not in the page cache, and/or you're unfortunate
> > > enough to have your git trees on an HDD.... it's not pretty.)
> > 
> > I recommend the "static cache" or whatever that thing is called, that
> > helps out a _LOT_ with stuff like this.  For the kernel tree, which is
> > never rebased, it speeds up this so much.
> 
> At the risk of asking a stupid question, which cache is this?  I don't
> think it's the untrackedCache; is it the BitmapHashCache?

It's the 'commitGraph', here's the article I was trying to remember I
learned this from:
	https://blogs.msdn.microsoft.com/devops/2018/06/25/supercharging-the-git-commit-graph/

greg k-h